TOPIC: "Submit" button says "Next" instead

I'm working on a survey and have an issue that has not occurred before -- on the final page of the survey, the button says "Next" instead of "Submit" as it normally does. Has anyone else experience this?

Any ideas of the fix? My survey is here. Please enter "Test" in at least one open-ended field if you take the survey to offer input.

That survey is pretty slow for me to diagnose, but that usually occurs when there are conditional question on the last group. If the last group does not get shown, that results in a "next" instead of "submit" for the last group. I get around this by making the last group contain at least one question asked of every respondent.